A young woman, Paula Alquist (played by Ingrid Bergman) leaves her home in England for Italy, for singing lessons. There she meets and falls in love with a pianist, Gregory Anton (played by Charles Boyer). They marry and move back to London, to live in the house Paula's aunt was murdered in, 10 years earlier. However, Gregory's intentions toward Paula aren't entirely romantic, or benevolent...
For a movie with such sinister plots involved, this movie is quite predictable. You can see all the links and plans involving Gregory in the first 40 minutes or so. And some of his plans are just plain lame (the watch at the concert...).
Good performances from Bergman and Boyer plus Joseph Cotten and Dame May Whitty. 18-year old Angela Lansbury made her debut in this movie and puts in a solid performance.
The minor performances can be quite laughable though - the risk of filming an English setting in the US (and you can thank WW2 for that). Best example of this is the scene with a cop whose accent frequently veers violently between English Cockney and southern-US in mid-sentence! Unintentionally funny.
Ultimately a mediocre story, with some solid performances from the leads. Had heaps of potential, but much of this was squandered.